Cumulative-relapse incidence for patients with HL following RIC acute grade II–IV or extensive chronic GVHD (20·2% [95% CI 5·9–69·6%]) versus those with no GVHD or with only grade I acute or limited chronic GVHD (50·7% [35·4–72·4%]). Reprinted from The Lancet, 365, Peggs K.S., Hunter A., Chopra R., Parker A., Mahendra P., Milligan D., Craddock C., Pettengell R., Dogan A., Thomson K.J., Morris E.C., Hale G., Waldmann H., Goldstone A.H., Linch D.C., and Mackinnon S., Clinical evidence of a graft-versus-Hodgkin's-lymphoma effect after reduced-intensity allogeneic transplantation, 1934–1941, Copyright (2005), with permission from Elsevier.